Today on the trail: Mr. Trump, who’ll be endorsed by Ben Carson, campaigns in Missouri and Illinois; Mr. Rubio stays in his must-win home state of Florida; John R. Kasich is in Ohio; and Ted Cruz is in Florida and Illinois.

That conflicts with Russian news reports that he had died of a heart attack. He once managed the media wing of the state’s energy giant, Gazprom, before stepping down or, more likely, being forced out.

The nonprofit ministries have been around for decades, but they’ve been getting renewed attention since the Affordable Care Act passed in 2010, largely because the law exempts members from the requirement to have health insurance or pay a yearly fine.

Noteworthy

• Mourning Nancy Reagan.

Politicians, former heads of state and celebrities are gathering today for Mrs. Reagan’s funeral at the Ronald Reagan Presidential Library in Simi Valley, Calif., which she planned with her customary concern for detail (2 p.m. Eastern).

• At the movies.

Our critic calls “Eye in the Sky” a riveting thriller — and often a grim, suspenseful farce — about drone warfare and its perils. It opens in select cities today and stars Helen Mirren.

More than 60 top athletes have tested positive for meldonium, the drug that Ms. Sharapova, a tennis star, has admitted using. They haven’t been publicly identified because their cases are still being heard.

Meldonium was developed for heart patients, enhances blood flow and is not approved for sale in the U.S. It was placed on the World Anti-Doping Agency’s banned list this year.